Random suggestion for the fights. Have a adjustable multiplier next to each creature. The creature's stats are multiplier, and well as the kill count.
So fighting a 10x frog is 10 times as hard, but defeating one gives you 10 frog kills.
found a bug in here. after the big bot bit (heh heh) i went back a got all the stuff (ok i'm greedy) and then when i go down where the elevator is supposed to be i die.